28665313 has 2 divisors, whose sum is σ = 28665314. Its totient is φ = 28665312.

The previous prime is 28665293. The next prime is 28665331. The reversal of 28665313 is 31356682.

Together with next prime (28665331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28387584 + 277729 = 5328^2 + 527^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28665313 is a prime.

It is not a weakly prime, because it can be changed into another prime (28668313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14332656 + 14332657.

It is an arithmetic number, because the mean of its divisors is an integer number (14332657).

Almost surely, 2^28665313 is an apocalyptic number.

It is an amenable number.

28665313 is a deficient number, since it is larger than the sum of its proper divisors (1).

28665313 is an equidigital number, since it uses as much as digits as its factorization.

28665313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 34.

The square root of 28665313 is about 5353.9997198356. Note that the first 3 decimals coincide. The cubic root of 28665313 is about 306.0451931770.

The spelling of 28665313 in words is "twenty-eight million, six hundred sixty-five thousand, three hundred thirteen".